19400340 has 24 divisors (see below), whose sum is σ = 54321120. Its totient is φ = 5173408.

The previous prime is 19400317. The next prime is 19400341. The reversal of 19400340 is 4300491.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19400341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161610 + ... + 161729.

It is an arithmetic number, because the mean of its divisors is an integer number (2263380).

Almost surely, 2^19400340 is an apocalyptic number.

19400340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19400340 is an abundant number, since it is smaller than the sum of its proper divisors (34920780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19400340 is a wasteful number, since it uses less digits than its factorization.

19400340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323351 (or 323349 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 19400340 is about 4404.5817054517. The cubic root of 19400340 is about 268.7013079263.

The spelling of 19400340 in words is "nineteen million, four hundred thousand, three hundred forty".